Patent GB-828265-A (GB)
Title: Coin collectors for telecommunication services
IPC: H04M17/02
Filed: 1957-06-25
Abstract: 828,265. Coin-freed telephone apparatus. HALL, F. W., YOUNG, A., and ASSOCIATED AUTOMATION Ltd. June 25, 1958 [June 25, 1957], No. 19956/57. Class 27 The coin collector of an automatic telephone or other telecommunication service, of the post-payment type as described in Specification 810,351, has two or more pulsing cams 18A, 18B, 18C with numbers of lobes 19 corresponding to the value of each of two or more coins which the collector will accept and a pulsing contact 16 is carried by a lever 17 movable about a pivot 17A and contact 4C so that it is set opposite the appropriate cam according to the value of the inserted coin. After a connection between the caller and the called party has been established a signal, such as reversal of polarity, operates an electromagnet and a locking lever 12E is withdrawn from the gap 10C between locking levers 9B, 9C, thus allowing movement of these levers and of a further locking lever 9A. An inserted coin raises the appropriate coin lever, such as 4B, and also a common carriage 6 which, on its descent, operates the mechanism. Only one coin can be inserted at a time as one of the wedgeshaped blades 8A, 8B, 8C on each lever occupies the space available at 10A, 10B or 10D between the levers 9A, 9B, 9C and fixed abutments 9D. Towards the end of upward movement of the carriage 6, it raises a yoke 7 and allows a spring-loaded lever 11 to outer space 10C to prevent insertion of another coin during the pulsing operation; the yoke is held in this position by a bell crank 13A until a pin 6A on the rescending carriage 6 hits an arm 13B of the bell crank. A shaft 18 connected to the carriage 6 by a link 19B carries the pulsing cams 18A, 18B, 18C and a full-stroke ratchet 20 cooperating with a pawl 20B and a link 23 and pawl 22A drives gearing 21C connected to centrifugal governor mechanism 21 for controlling the speed of descent of the carriage 6. The outer coin levers 4A, 4C are connected through springs 25A, 25C 4C are connected through springs 25A, 25C to a lever 24D and insertion of a coin past one of the levers causes the lever 24D to rock to one side or the other and this movement is transmitted by an extension 27 and link 27B to the contact lever 17 to swing the contact 16 opposite the appropriate cam 18A or 18C; the middle coin lever does not rock the lever 24D and the contact remains opposite the middle cam 18B. A detent lever 29, released by a pin 18D on the cam 18C striking the arm 31D of a bell crank 31, enters one of three slots in the contact lever 17 to hold it in adjusted position until the pin 18D hits the tail 29D of the detent lever at the end of the return pulsing stroke of the cam. Except during the pulsing period following the insertion of a good coin, the collector is electrically masked from the lines by a closed shorting contact 32 but an accepted coin in passing from a coin tester to a coin box momentarily displaces a plate and allows a bell crank 32C to rotate to open the contact until a pin 23A on the link 23 rotates the bell crank 32C back during the final part of the descent of the carriage 6.